Fire-extinguishing composition.



UNITED STATES yPATENT OFFICE;-

HARR'Y S. MURK, -ClIl BBOOKLINE, MASSACHUSETTS, ASSIGNOR T0 AMERICAN j l LA FRANCE FIRE ENGINE COMPANY, INC., F ELMIRA, NEW YO'RK, A GB.-

PORATION 0F NEW YORK.

l FIRE-EXTINGUISHING COMPOSITIQN.

mi brewing.

To all whom t may concern.'

Be it known that I, HARRY S. Monx, n citizen of the United States, and resident of rooklinc, county of Norfolk, `Stn te of Massiichusetts, have invented uv certain new and luseful Fire-Extinguishing Composition, of which the following is a speci ficction.

My invention relates in general to fire cxtnguishing com ounds or compositions of the type embodylng substances for the production ,of n relatively heavy blanket of gas or vapor to smother the lire,-Whle ut the 4saine time possessing in its normal state, a

permanence and aio-called non-freezing churncter. Curbon-tetrn-chlorid luis uli'ea- Ybeen Vproposed and employed ns n principal comp oncnt of suoli compositions, und other substances have been added to the cnrbon-tetrnchlorid to lower its freezing point, to retard the dispersion of the gais or vapor which is produced when the composition is employed tetrach for extinguishing the lire, und to reduce the corrosive 'action of the liquid on the metal of the container in which it is'stoi'cd for use.

The lfire extinguishing composition, :ic-'

to my' invention, comprises carbonorid ns its main iii redient, und one or more ingredients for reucing the freezing point of the mixture, lowering the boiling point and retarding the rute of evaporation.

In my prior application filed February'26, 1917, serially numbered 151,099, I have set forth n; fire extinguishing composition in which cnrbon-tetrachlorid, chloroform und ain aromatcestcr .or o mixture of aromatic esters of relatively high boiling,` point a-re employed. Instend of using aromatic esters iii the present instance, I employ pine oil. In its broader aspect, the composition is not limited to the use of chloroform, but mcy comprise es its essentiel ingredients, carbontetriichlorid and pine oil, but I prefer the mixture of cerbon-totru-ehlorid, pine oil and chloroform, und regard this as constituting un fimportunt specific 4en lbodiirie'nt of a broader invention. Furthermore, where nnother freezing point lowering'censtituent in Oordiii 4addition to pine oil is desired, 1 muy use instead of chlorofornn,some-other suitable ingredient such es for example, dichlorinetl'iane, or trichlorethylenc; or mixtures of two r penincatlon of Letters Patent. Patented Nov, 13, 1917, Application led Hutch 21. 1817.. Serial No. 157,642.

structure belonging to the class of terpenes. It 1s of relatively high boiling point and 'moderately high eva eration rate. Added is desired t. at the composition should pos sees the low freezing point which is customarily required, as for example --50 F. or lower, it becomes importent to include chloroform with the carbon-tetrachlorid and pine oil, as in this wey the desired low freezing point is attained without increasing the' percentage. of pine oil unduly. -At the same time, the use of pine oil may be regarded as serving also to econoinize chloroform.j

In. order to illustrate the low freezing point obtained by the mixture of carbontetrnchlorid nud pine oil, I muy sta-te thnt c mixture of. for exemple 95% of carbonietrnehlorid und 5% of pine oil by voluine, exhibits o freezing: point of soinmvhcrein the iieigliliorliood of 28 F. while with 90% carbon-tetrncliloi-id und ine oil, the

freezing point heroines still uwer, being' close to F. Such mixtures constitute eili'eient fire extinguishing compositions o -nd are suitnhle for use where the lower freezing points are not deuuindcd.

The effect of including chloroform in the composition will lic ut once :ipp-arent from a. s'eeific example of the invention, in which tiie thi-oe essential ingredients are employed.

I muy refer to n composition comprising cci-bondetrnchlorid, 5% iiue oil :mtl 5% chloroform, l'iy volume. llie freezing ioint of such n mixture is in the neighborliod of -52 F. and thus comes Within the usuul requirements with respect to thc abil'- ity to resist low temperatures while rainniniinr in Ilic. liquid stein. Tr. wili he uiipnrerit that coi-responding changes in 'Freezing point will be obtained by varying ihc proportions of the severe] ingredients,".ind the invention is not 'no lie ui'idei'stood es limited precisely to any one or more or the specme exemples recited.

Lx e. I' l l herrn 'n Lie ccmpmmons w nce so 1er tested., mnbodying the ingredients of the present in vonton, are found. to exhibit good fire extinguishing proporties, and in udditi'on'to the low 'troc-:zing points already mentioned, they offer tlm advantages of being permanent liquids under all ordina-ry conditions of storage in tho containers usually employed, not showing any marked como sive action upon the material of such con tainers, und boing free 'from sediment or deposits during longr periods o1 non-use.

I claim:

'1. A. fire extinguishing composition c011- tainin as essential ingredients, carbontetrac ilorid and pine-oil.

2. A firs, extinguishing composition oomprising as; essential invredients, carbon tetruohlord, pine oil an another freezing point lowering constituent. I Y

3. A re extinguishing compositioncomprising as essential ingredients, carbon tetrnchlorid, pine oil nd chloroform.

4. A fire extinguishing. composition comprsin approximately 90% of carbon-tottichlori, 5% chloroform and 5% pine oil.

HARRY S. MORK. 

